1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.servlet.filters.etag;
24  
25  import com.liferay.portal.kernel.util.StringPool;
26  import com.liferay.portal.servlet.filters.BasePortalFilter;
27  import com.liferay.util.servlet.filters.CacheResponse;
28  import com.liferay.util.servlet.filters.CacheResponseData;
29  import com.liferay.util.servlet.filters.CacheResponseUtil;
30  
31  import javax.servlet.FilterChain;
32  import javax.servlet.http.HttpServletRequest;
33  import javax.servlet.http.HttpServletResponse;
34  
35  /**
36   * <a href="ETagFilter.java.html"><b><i>View Source</i></b></a>
37   *
38   * @author Eduardo Lundgren
39   */
40  public class ETagFilter extends BasePortalFilter {
41  
42      protected void processFilter(
43              HttpServletRequest request, HttpServletResponse response,
44              FilterChain filterChain)
45          throws Exception {
46  
47          CacheResponse cacheResponse = new CacheResponse(
48              response, StringPool.UTF8);
49  
50          processFilter(
51              ETagFilter.class, request, cacheResponse, filterChain);
52  
53          CacheResponseData cacheResponseData = new CacheResponseData(
54              cacheResponse.getData(), cacheResponse.getContentType(),
55              cacheResponse.getHeaders());
56  
57          if (!ETagUtil.processETag(request, response, cacheResponse.getData())) {
58              CacheResponseUtil.write(response, cacheResponseData);
59          }
60      }
61  
62  }